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Evolution géomorphologique du haut bassin durancien depuis la dernière glaciation: contribution à la compréhension du système paraglaciaire

Abstract : Global change has opened up new perspectives of research in geomorphology, particularly in alpine areas where glacial retreat implies specific adjustments, called paraglacial. During the last three decades, paraglacial processes have been identified and their rate of activity documented. However such adjustments have never been integrated in a whole landsystem. Thus, conceptualizations of sediments storage and release are needed. This work is led at two time scales. First, since the late glacial maximum (20 000BP), we document the consequences of glacial decay on slope instability and debuttressing. A chronological framework of both glacial retreat and timing of mass-movement triggering, based upon cosmogenic datings, is established. The comparison of datings implies that instabilities occurred as soon as valleys became ice-free. Second, since the little ice age (1850 AD), consequences of ice-melting and the lowering of the surface of glacier tongue (actings as a local base-level) are documented. Those two parameters have generated the reworking of sediments, and the progressive organization of sediment paths transfer from supraglacial slopes to valley bottom. The duration of such adjustment may occur many decades after glacial retreat because lateral and frontal moraines generated many sediment traps.
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https://tel.archives-ouvertes.fr/tel-00139899
Contributor : Etienne Cossart <>
Submitted on : Tuesday, April 3, 2007 - 6:28:40 PM
Last modification on : Tuesday, January 19, 2021 - 11:08:12 AM

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  • HAL Id : tel-00139899, version 1

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Etienne Cossart. Evolution géomorphologique du haut bassin durancien depuis la dernière glaciation: contribution à la compréhension du système paraglaciaire. Géographie. Université Paris-Diderot - Paris VII, 2005. Français. ⟨tel-00139899⟩

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